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A440

The modern pitch standard: the A above middle C vibrates at 440 Hz. Also called concert pitch.

The Savvy Take

Your piano drifts flat over the years, not sharp — string tension slowly relaxes. Let it drift too long and a single tuning can't pull it back; that's when your technician starts saying “pitch raise.”

Appears in these guides

Can I Tune My Piano Myself? – Risks and Considerations of trying to tune your own piano
Understanding Piano Tuning: What a Piano Tuner Really Does

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